Linear Amplifier Alignment Tweak

When using the main laser, it appeared the beam was being clipped somewhere. By taking burn paper marks it seemed as thought the beam was clipping in the linear amplifiers somewhere. WinCam #3 was used to look at the beam outside the laser. The alignment through the linear amplifiers was adjusted by tweaking the turning mirror immediately before them. Burn paper marks shown below were taken after adjusting the alignment showing a now roughly circular beam.

Given the beam has now been adjusted to have a more Gaussian profile, it is more difficult to identify the shape properly on burn paper. With a top hat profile that the laser originally had, the edge of the beam was much clearer.

Burn Paper Marks

Figure 1: After the RGA and the isolator

Figure 2: Immediately before the linear amplifiers

Figure 3: Immediately before the SHG crystal

Figure 4: At output window of laser.